英语释义
1. of, relating to, or being a hair-containing cyst of the skin in the lower-back region near the upper crease of the buttocks
2. containing hair nested in a cyst —used of congenitally anomalous cysts in the sacrococcygeal area that often become infected and discharge through a channel near the anus
3. of, relating to, involving, or for use on pilonidal cysts, tracts, or sinuses